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temporary hardness

   Also found in: Dictionary/thesaurus 0.01 sec.
temporary hardness [′tem·pə‚rer·ē ′härd·nəs]
(chemistry)
The portion of the total hardness of water that can be removed by boiling whereby the soluble calcium and magnesium bicarbonate are precipitated as insoluble carbonates.


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The temporary hardness level is relatively high and would normally be treated by the addition of an acid (generally sulphuric) to neutralise the alkalinity and lower the pH towards the more neutral/acid side, to facilitate the correct enzyme action in the mash stage of the brewing process.
In the opposite mode, chelators cause a chemical reaction that changes temporary hardness into permanent hardness; the salts that react with the chelator join the solution.
 
 
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